Add a soprano recorder tab converter as a Linux AppImage.

The app turns a lead line into Baroque fingering tabs with rhythm kept, ships Twinkle and Ode to Joy, and reads photos locally with oemer when the bundled Python is present.

Co-authored-by: catpersonisme <catpersonisme@gmail.com>

src/app/api/recognize/route.ts

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+import { connection } from "next/server";
+import { recognizeImage, recognizerInfo } from "@/lib/recognize";
+
+const TYPES = new Set(["image/png", "image/jpeg", "image/webp"]);
+
+export async function GET() {
+  await connection();
+  return Response.json(recognizerInfo());
+}
+
+export async function POST(request: Request) {
+  let form: FormData;
+  try {
+    form = await request.formData();
+  } catch {
+    return Response.json({ error: "The upload could not be read. No notes were invented." }, { status: 400 });
+  }
+
+  const image = form.get("image");
+  if (!(image instanceof File)) {
+    return Response.json({ error: "Choose a PNG, JPG, or WEBP image first." }, { status: 400 });
+  }
+  if (image.size === 0) {
+    return Response.json(
+      { error: "That file is empty. No notes were invented." },
+      { status: 400 },
+    );
+  }
+  const named = /\.(png|jpe?g|webp)$/i.test(image.name);
+  if (image.type && !TYPES.has(image.type) && !named) {
+    return Response.json(
+      { error: "Use a PNG, JPG, or WEBP photo. That file is not one of those. No notes were invented." },
+      { status: 415 },
+    );
+  }
+  if (image.size > 8 * 1024 * 1024) {
+    return Response.json(
+      { error: "That image is over 8 MB. Crop the line or export a smaller JPEG." },
+      { status: 413 },
+    );
+  }
+
+  const result = await recognizeImage(image);
+  if (!result.ok) {
+    return Response.json({ error: result.error, recognizer: result.recognizer }, { status: result.status });
+  }
+  return Response.json({
+    score: result.score,
+    warnings: result.warnings,
+    recognizer: result.recognizer,
+  });
+}

src/app/globals.css

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+@import "tailwindcss";
+@import "tw-animate-css";
+@import "shadcn/tailwind.css";
+
+@custom-variant dark (&:is(.dark *));
+
+@theme inline {
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --font-sans: var(--font-source);
+  --font-mono: var(--font-geist-mono);
+  --font-heading: var(--font-display);
+  --color-sidebar-ring: var(--sidebar-ring);
+  --color-sidebar-border: var(--sidebar-border);
+  --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
+  --color-sidebar-accent: var(--sidebar-accent);
+  --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
+  --color-sidebar-primary: var(--sidebar-primary);
+  --color-sidebar-foreground: var(--sidebar-foreground);
+  --color-sidebar: var(--sidebar);
+  --color-chart-5: var(--chart-5);
+  --color-chart-4: var(--chart-4);
+  --color-chart-3: var(--chart-3);
+  --color-chart-2: var(--chart-2);
+  --color-chart-1: var(--chart-1);
+  --color-ring: var(--ring);
+  --color-input: var(--input);
+  --color-border: var(--border);
+  --color-destructive: var(--destructive);
+  --color-accent-foreground: var(--accent-foreground);
+  --color-accent: var(--accent);
+  --color-muted-foreground: var(--muted-foreground);
+  --color-muted: var(--muted);
+  --color-secondary-foreground: var(--secondary-foreground);
+  --color-secondary: var(--secondary);
+  --color-primary-foreground: var(--primary-foreground);
+  --color-primary: var(--primary);
+  --color-popover-foreground: var(--popover-foreground);
+  --color-popover: var(--popover);
+  --color-card-foreground: var(--card-foreground);
+  --color-card: var(--card);
+  --radius-sm: calc(var(--radius) * 0.6);
+  --radius-md: calc(var(--radius) * 0.8);
+  --radius-lg: var(--radius);
+  --radius-xl: calc(var(--radius) * 1.4);
+  --radius-2xl: calc(var(--radius) * 1.8);
+  --radius-3xl: calc(var(--radius) * 2.2);
+  --radius-4xl: calc(var(--radius) * 2.6);
+}
+
+:root {
+  --background: oklch(0.955 0.02 85);
+  --foreground: oklch(0.27 0.03 55);
+  --card: oklch(0.985 0.012 92);
+  --card-foreground: oklch(0.27 0.03 55);
+  --popover: oklch(0.985 0.012 92);
+  --popover-foreground: oklch(0.27 0.03 55);
+  --primary: oklch(0.42 0.07 48);
+  --primary-foreground: oklch(0.98 0.01 90);
+  --secondary: oklch(0.93 0.02 85);
+  --secondary-foreground: oklch(0.32 0.04 50);
+  --muted: oklch(0.94 0.015 85);
+  --muted-foreground: oklch(0.45 0.03 55);
+  --accent: oklch(0.9 0.035 150);
+  --accent-foreground: oklch(0.28 0.04 155);
+  --destructive: oklch(0.5 0.16 28);
+  --border: oklch(0.86 0.025 75);
+  --input: oklch(0.86 0.025 75);
+  --ring: oklch(0.55 0.07 48);
+  --chart-1: oklch(0.87 0 0);
+  --chart-2: oklch(0.556 0 0);
+  --chart-3: oklch(0.439 0 0);
+  --chart-4: oklch(0.371 0 0);
+  --chart-5: oklch(0.269 0 0);
+  --radius: 0.8rem;
+  --sidebar: oklch(0.985 0 0);
+  --sidebar-foreground: oklch(0.145 0 0);
+  --sidebar-primary: oklch(0.205 0 0);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.97 0 0);
+  --sidebar-accent-foreground: oklch(0.205 0 0);
+  --sidebar-border: oklch(0.922 0 0);
+  --sidebar-ring: oklch(0.708 0 0);
+}
+
+.dark {
+  --background: oklch(0.145 0 0);
+  --foreground: oklch(0.985 0 0);
+  --card: oklch(0.205 0 0);
+  --card-foreground: oklch(0.985 0 0);
+  --popover: oklch(0.205 0 0);
+  --popover-foreground: oklch(0.985 0 0);
+  --primary: oklch(0.922 0 0);
+  --primary-foreground: oklch(0.205 0 0);
+  --secondary: oklch(0.269 0 0);
+  --secondary-foreground: oklch(0.985 0 0);
+  --muted: oklch(0.269 0 0);
+  --muted-foreground: oklch(0.708 0 0);
+  --accent: oklch(0.269 0 0);
+  --accent-foreground: oklch(0.985 0 0);
+  --destructive: oklch(0.704 0.191 22.216);
+  --border: oklch(1 0 0 / 10%);
+  --input: oklch(1 0 0 / 15%);
+  --ring: oklch(0.556 0 0);
+  --chart-1: oklch(0.87 0 0);
+  --chart-2: oklch(0.556 0 0);
+  --chart-3: oklch(0.439 0 0);
+  --chart-4: oklch(0.371 0 0);
+  --chart-5: oklch(0.269 0 0);
+  --sidebar: oklch(0.205 0 0);
+  --sidebar-foreground: oklch(0.985 0 0);
+  --sidebar-primary: oklch(0.488 0.243 264.376);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.269 0 0);
+  --sidebar-accent-foreground: oklch(0.985 0 0);
+  --sidebar-border: oklch(1 0 0 / 10%);
+  --sidebar-ring: oklch(0.556 0 0);
+}
+
+@layer base {
+  * {
+    @apply border-border outline-ring/50;
+  }
+  body {
+    @apply bg-background text-foreground;
+  }
+  html {
+    @apply font-sans;
+  }
+}

src/app/layout.tsx

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+import type { Metadata } from "next";
+import { Fraunces, Source_Sans_3 } from "next/font/google";
+import { Toaster } from "@/components/ui/sonner";
+import "./globals.css";
+
+const sans = Source_Sans_3({
+  subsets: ["latin"],
+  variable: "--font-source",
+  weight: ["400", "500", "600", "700"],
+});
+
+const display = Fraunces({
+  subsets: ["latin"],
+  variable: "--font-display",
+  weight: ["500", "600", "700"],
+});
+
+export const metadata: Metadata = {
+  title: "Recorder Tab Converter",
+  description:
+    "Turn a lead melody into soprano recorder fingering tabs, with rhythm, rests, and bar lines kept.",
+};
+
+export default function RootLayout({ children }: LayoutProps<"/">) {
+  return (
+    <html lang="en" className={`${sans.variable} ${display.variable} h-full antialiased`}>
+      <body className="min-h-full flex flex-col font-sans">
+        {children}
+        <Toaster />
+      </body>
+    </html>
+  );
+}

src/app/page.tsx

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+import { Converter } from "@/components/converter";
+
+export default function Home() {
+  return (
+    <main>
+      <Converter />
+    </main>
+  );
+}